You'll need to remove screws that are by the door handle,
arm rest, under door and side of door and then gently pull back on the
panel as there will also be retaining clips attached and you don't want
to break them. Then pull back the weather seal
(can't reuse it, but it's not that important) and you will be able to
access everything.It sounds like the guide rails are loose

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you will need to take off door panel and roll the window down. You should be able to look inside and see the tracks it rolls up and down on. disconnect from tracks and pull old window out the top of door, slide new window in and hook to tracks, should be very easy to install on such an older truck.

be careful with jeeps they have a body control module that controls the windows , locks ect they go out often a dealer with scanner can check. also you have the window switch on the drivers door , rarely is it the regulator on a jeep